JP3356397B2 - Working machine at height - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work machine which can be used for various works at high places such as inside and outside a building, repair work on an outer surface of a ship, and maintenance work on an airplane.

[0002]

2. Description of the Related Art Conventionally, various types of aerial work machines have been developed or proposed as the aerial work machines for the above-mentioned purpose. For example, Japanese Patent Application Laid-Open No. Hei 5-3501 describes an example of such an aerial work machine. There is an aerial work machine. Such an aerial work machine is substantially composed of a traveling vehicle, a mast which is mounted on the traveling vehicle and includes a plurality of vertically elongated mast constituent members which can expand and contract vertically, and a mast extending and contracting the mast vertically. A mechanism and a work bucket attached to the uppermost mast component. Then, by driving the mast expansion / contraction mechanism, the mast can be extended and retracted to raise and lower the work bucket to an arbitrary height position, and the operator can perform a predetermined work at a predetermined height position.

[0003]

However, the aerial work machine described above still has the following problems. That is, as described in Japanese Unexamined Patent Publication No. Hei 5-3501, the mast is formed by gradually reducing the diameter of a plurality of mast constituent members consisting of a large number of hollow circular cross-section cylinders in order from the lower stage to the upper stage. It is constituted by telescopically or telescopically insertable telescopically. Therefore, as the height of the work machine at a higher place becomes higher, the diameter of the upper mast constituent member becomes thinner, and sufficient rigidity for supporting the work bucket cannot be obtained. In addition, since the mast telescopic mechanism is generally configured by incorporating a telescopic cylinder or the like in the mast, it is difficult or difficult to determine the operating state of the telescopic cylinder or the like from the outside, and if a failure occurs once In this case, the entire mast had to be disassembled, and the telescopic cylinder and the like had to be repaired and replaced, and maintenance was complicated. The present invention can solve the above-described problems, can support a work bucket in a stable state even when the height of a high-altitude working machine is sufficiently high, and can easily perform high-altitude work. The purpose is to provide a machine.

[0004]

According to a first aspect of the present invention, there is provided an aerial work machine, comprising: a traveling vehicle; and a plurality of vertically elongated vehicles mounted on the traveling vehicle and capable of vertically extending and contracting. A mast comprising a mast component, a mast expansion / contraction mechanism that expands and contracts the mast in the vertical direction, and a work bucket attached to the uppermost mast component in a high place work machine, wherein each of the mast components is A vertically elongated channel member having a vertically elongated slit on the front surface, and a pair of vertically elongated angles in which a base of one side forming portion projects rearward from a rear surface of the channel member and the other side forming portion extends symmetrically in the width direction. And one side forming portion of both the angle members of the upper mast constituent member penetrates the vertically elongated slit of the lower mast constituent member, and the upper mast constituent member The other side forming part of the strike component is configured to slidably engage the both side groove portion of the lower groove-shaped channel member, respectively. The above-mentioned aerial work machine is also characterized by the following configuration. The mast expansion / contraction mechanism includes a plurality of lifting / lowering force transmission cables each having one end connected to the upper end of the lower mast constituent member and the other end connected to the lower end of the upper mast constituent member. Except for the uppermost mast component, a plurality of sheaves each pivotally supported at the upper end of each mast component and respectively engage with a corresponding lifting / lowering force transmission cable, By lifting and lowering the sheave provided on the mast component of the second stage, the lifting and lowering force transmission line corresponding to the sheave is tensioned, and the other lifting and lowering force transmission line is also tensioned by the other sheaves. A lifting cylinder that raises and lowers all the mast components relative to the lower mast component. A pair of sheaves is attached to each mast component, and the sheaves of each pair are arranged in a staggered manner in the width direction with respect to the other pair of sheaves positioned above and below. A plurality of masts are mounted on the traveling trolley at parallel intervals in the width direction, and a work bucket is provided between the uppermost mast constituent members of the plurality of masts.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the accompanying drawings. (First Embodiment) First, the overall construction of a high-altitude working machine A according to the present embodiment will be described with reference to FIGS.

[0006] As shown in the figure, a traveling carriage 11 is constructed by attaching a free wheel 12 and a fixed wheel 13 to a front portion and a lower portion of a rectangular frame, respectively. Traveling trolley 11
A mast 14 is mounted on the top, and the mast 14 includes a plurality of vertically elongated mast constituent members 15 to
19 is formed. The mast 14 is configured to be vertically expandable and contractable by a mast expansion mechanism 20 described later. Then, the mast constituent member 19 in the uppermost stage
A work bucket 22 surrounded by a fence 21
Is attached.

Next, the configuration of each part of the aerial work machine A having the above configuration will be specifically described with reference to FIGS.

As shown in FIG. 3, an outrigger mounting cylinder 23 is provided on both sides of a front portion and a rear portion of the traveling vehicle 11, respectively.
a and 23b are attached to the outrigger mounting cylinders 23a and 23b.
Outriggers 24 and 25 for preventing overturning of the vehicle 1 are detachably mounted. The outriggers 24, 2
5 is withdrawn from the outrigger mounting tubes 23a and 23b when the traveling vehicle 11 is traveling, and is stored on the traveling vehicle 11.

As shown in FIG. 1 and FIGS.
A plurality of vertically long mast constituent members 15 to 19 constituting 4
Have substantially the same configuration. That is, each of the mast constituent members 15 to 19 is formed of a vertically elongated channel-shaped channel member 26 forming a front portion thereof, and a pair of angle members 27 forming a rear portion thereof. The mast component 1
5 to 19 are the channel member 26 and the angle member 2
7 can be manufactured by integral molding, and the angle member 27 can be integrated with the channel member 26 by welding or the like.

As shown in FIGS. 4 and 5, the groove-shaped channel member 26 has a vertically long slit 28 on the front surface and side grooves 29 on both sides thereof. On the other hand, each of the angle members 27 has a base portion protruding from the rear surface of the channel-shaped channel member and extends rearward, and extends symmetrically in the width direction from the tip of the one side formation portion 30. It is formed from a pair of other side forming portions 31.
One side forming portion 30 of each of the angle members 27 of the upper mast component (for example, the mast component 17) passes through the vertically elongated slit 28 of the lower mast component (for example, the mast component 16), and The other side forming portions 31 of the mast constituent member (for example, the mast constituent member 17) are configured to slidably engage with both side grooves 29 of the lower channel-shaped channel member (for example, the mast constituent member 16). I have. Also, the lowermost mast component 15
Is fixed to the mounting surface of the traveling vehicle 11, and as described above, the work bucket 22 is attached to the front surface of the uppermost mast component member 19.

Next, the mast lifting mechanism 20 will be described. As shown in FIGS. 4 to 6, one end of a chain 32 to 34, which is an example of a plurality of lifting force transmitting cables, is connected to lower mast constituent members 15 to 17. The other ends of the chains 32 to 34 are connected to the lower ends 17b to 19b of the upper mast constituent members 16 to 19, respectively, while being connected to the upper ends 15a to 17a, respectively. Note that the chains 32 to 34 are alternately arranged inside and outside in order to prevent mutual overlap. First and uppermost mast components 15, 19
Except for the upper end 16a of each mast component 16-18
To 18a are each a sprocket 3 which is an example of a sheave.
5 to 37 are rotatably supported, and the sprocket 3
The corresponding chains 32 to 34 are engaged with 5 to 37, respectively. An elevating cylinder 41 composed of a hydraulic cylinder is provided upright on the traveling carriage 11, and a sprocket 35 is rotatably attached to the tip of an extendable rod 42. The lifting cylinder 41 is driven by operating a hydraulic unit 41 a attached to the lower surface of the traveling vehicle 11.

With this configuration, the hydraulic unit 41a
Is operated to advance the lifting cylinder 41 to move the sprocket 3
When the chain 5 is raised and the chain 32 is tensioned and lifted upward, the second-stage mast component 16 rises relatively to the first-stage mast component 15. Then, in conjunction with this rise, the other sprockets 36, 37
Also lifts the corresponding chains 33 and 34 in tension, so that all the mast components 17 on the third and subsequent stages
19 can also rise relative to the lower mast component members 16 to 18, so that the entire height of the mast 14 can be sufficiently extended. Conversely, the lifting cylinder 4
1 is lowered to lower the sprocket 35, thereby lowering the mast constituent members 16 to 19, and
Can be reduced to a minimum height where there is no support for running inside a factory or building.

As shown in FIG. 5, a pair of sprockets 36 attached to each mast component (for example, mast component 17) are connected to other mast components (for example, mast component The members 16 and 18) are arranged in a zigzag manner so as to be shifted in the width direction with respect to the pair of sprockets 35 and 37. Therefore, the sprocket 35,
36 and 37 can be engaged with each other in the front-rear direction,
The overall thickness of the mast 14 in the front-rear direction can be made as thin as possible, the overturning moment can be reduced, and the design can be improved.

Another configuration in the illustrated embodiment will be described. As shown in FIG. 5, the lower mast constituent member (for example, the mast constituent member 16) is fitted into both side grooves 29 of the grooved channel member 26. Guide rollers 44, before and after the other side forming portion 31 of the angle member 27 of the upper mast component (for example, the mast component 17),
A roller support shaft 46, 47 of these guide rollers 44, 45 is attached to the upper end of each of the mast components 16-18.

As shown in FIG. 1, an anti-swing member 48 for preventing the mast 14 from shaking in the left-right direction is mounted on the traveling carriage 11, and an operation switch 49 is mounted on the work bucket 22. Operation switch 4
9 is a code reel 50 installed on the traveling carriage 11
It is connected to the.

Next, an aerial work machine A having the above configuration
The operation of will be described. As shown by the solid line in FIG. 1, when the aerial work machine A is not used, the mast 14 is moved to the storage position, that is, the lowest height position, in order to smoothly move the aerial work machine A to the work location. is there.

Next, the aerial work machine A is moved to the work location. Outriggers 13 and 14 from bogie body 11
Is taken out, attached and fixed to the outrigger attachment portion, and the carriage body 11 is supported in a stable state. The operator gets into the work bucket 22, operates the operation switch 49, drives the elevating cylinder 41 to advance, and relatively slides the mast components 15 to 19, thereby extending the mast 14 to a predetermined height position. And stop. Thereafter, the worker can perform a predetermined operation, for example, a coating operation.

As described above, in the present embodiment, the mast 1
4 is made up of a plurality of mast components 15 to 19, each of which is composed of a channel-shaped channel member and an angle member having the same shape, and which are slidably fitted to each other, thereby ensuring sufficient rigidity over the entire height. Therefore, even when the overall height is sufficiently high, the work bucket can be supported in a stable state, and the mast expansion / contraction mechanism 20 is exposed to the outside, so that maintenance can be easily performed.

Further, the mast expansion / contraction mechanism 20 substantially comprises a plurality of lifting / lowering force transmission cables 32-34 and a plurality of sheaves 35-37.
Since it is composed of only one lifting cylinder 41, the mast expansion / contraction mechanism 20 can be manufactured at low cost.

Further, the sprockets 35, 36, 37 can be engaged with each other in the front-rear direction, and the overall thickness of the mast 14 in the front-rear direction can be reduced as much as possible, so that the overturning moment of the mast 14 can be reduced. At the same time, it is possible to improve the design of the aerial work machine A.

(Second Embodiment) As shown in FIG.
In the aerial work machine A1 according to the present embodiment, a plurality of a pair of masts 50 and 51 having the same configuration as the above-described mast 14 are mounted on the traveling carriage 52 at parallel intervals in the width direction. The work bucket 55 is a pair of masts 50, 51
Is mounted between the uppermost mast constituent members 53 and 54 in a suspended state. With this configuration, the work bucket 55 can be supported in a more stable state not only in the front-back direction but also in the left-right direction. In FIG. 7, reference numerals 56 and 57 denote outriggers.

[0022]

As described above, in the aerial work machine according to the first aspect of the present invention, the mast slides a plurality of mast constituent members each including a channel-shaped channel member and an angle member having the same shape. Since it is configured by fitting in the moving state, sufficient rigidity can be secured over the entire height, and the work bucket can be supported in a stable state even when the overall height is sufficiently high. In addition, since the mast extension mechanism is exposed to the outside, maintenance can be easily performed.

Also, in the high working machine according to the present invention, the mast expansion / contraction mechanism is substantially composed of only a plurality of lifting / lowering force transmission cables, a plurality of sheaves, and one lifting / lowering cylinder. It can be manufactured at low cost.

Further, the high working machine of the present invention can engage the sheaves in the front-rear direction and reduce the overall thickness of the mast in the front-rear direction as much as possible. In addition to being smaller, the design of the aerial work machine can be improved.

Further, in the aerial work machine according to the present invention, a plurality of masts are mounted on a traveling carriage at parallel intervals in a width direction, and a work bucket is installed between uppermost mast constituent members of these masts. The work bucket can be supported in a more stable state not only in the front-rear direction but also in the left-right direction.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work machine according to a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is an explanatory diagram of the operation state.

FIG. 5 is an enlarged cross-sectional view of a mast.

FIG. 6 is a top enlarged side view of the mast.

FIG. 7 is a side view of an aerial work machine according to a second embodiment of the present invention.

[Explanation of symbols]

 A: Working machine at height 11: Traveling carriage 14: Mast 15: Mast component 16, 17, 18, 19: Mast component 26: Channel member 27 ...・ Angle member 28 ・ ・ ・ Vertical slit 29 ・ ・ ・ Groove part 30 ・ ・ ・ One side forming part 31 ・ ・ ・ Other side forming part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66F 9/06 B66F 9/08

Claims (1)

(57) [Claims] An outrigger mounting cylinder is attached to both sides of a front part and a rear part, and a traveling bogie having an outrigger detachably mounted on the mounting cylinder is mounted on the traveling bogie and vertically expandable and contractible. A high place working machine comprising: a mast including a plurality of vertically long mast constituent members; a mast expansion / contraction mechanism that expands and contracts the mast in a vertical direction; and a work bucket attached to the uppermost mast constituent member. Each mast component member has a vertically elongated channel member having a vertically elongated slit on a front surface, and a base of one side forming portion projects rearward from a rear surface of the channel member, and the other side forming portion extends symmetrically in the width direction. And a pair of vertical angled members, each of which forms one side of the angled member of the upper mast component, and a vertical slot of the lower mast component. And the other side forming portions of the upper mast component are slidably engaged with both side grooves of the lower channel member, respectively. Two guide rollers are rotatably arranged at the upper end of each mast component member before and after the other side forming portion of the angle member of the upper mast component member fitted into both side grooves of the channel member. A plurality of lifting / lowering force transmission cables each having one end connected to the upper end of the lower mast component and the other end connected to the lower end of the upper mast component; And a plurality of sheaves pivotally supported at the upper end portions of the respective mast constituent members and respectively engaging with the corresponding lifting / lowering force transmission lines, except for the mast constituent member at the uppermost stage, and standing on the traveling bogie. Setting By lifting and lowering the sheave provided on the mast constituent member of the second stage, the lifting and lowering force transmission cable corresponding to the sheave is tensioned, and the other lifting and lowering force transmission cable is also interlocked by another sheave. An elevating cylinder that raises and lowers all the mast constituent members of the second and subsequent stages relative to the mast constituent members of the lower stage. Each of the mast constituent members has a pair of the sheaves. The sheaves of each pair are arranged in a staggered manner in the width direction with respect to the sheaves of the other pairs positioned above and below the pair, and the masts are paired and the traveling A plurality of work buckets are mounted on a trolley at parallel intervals in the width direction, and the work bucket is provided between uppermost mast constituent members of the plurality of masts.